GPER1 in Placental Cells (IMAGE) Duke University Caption Human placental cells were stained to indicate the presence of an estrogen receptor called GPER1, which helps protect the fetus from the immune response to viral infection. (Scale bar 75 micrometers) Credit Nicholas Heaton Lab, Duke University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.